SKU: 84483002319

Witty Pi 4 Mini: Realtime Clock and Power Management for Raspberry Pi

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Description

Witty Pi 4 Mini: Realtime Clock and Power Management for Raspberry PiWitty Pi 4 Mini is an uHAT shaped add on board that adds realtime clock and power management to your Raspberry Pi. Free shipping on this item!!! Witty Pi is an add on board that adds realtime clock and power management to your Raspberry Pi. It can define your Raspberry Pis ON OFF sequence, and significantly reduce the energy usage. Witty Pi 4 Mini is the fourth generation of Witty Pi and it has these hardware resources onboard: Factory calibrated and

Witty Pi 4 Mini is an uHAT shaped add-on board that adds realtime clock and power management to your Raspberry Pi.

 

Free shipping on this item!!!

 

Witty Pi is an add-on board that adds realtime clock and power management to your Raspberry Pi. It can define your Raspberry Pi’s ON/OFF sequence, and significantly reduce the energy usage. Witty Pi 4 Mini is the fourth generation of Witty Pi and it has these hardware resources onboard:

  • Factory calibrated and temperature compensated realtime clock with ±2ppm accuracy.
  • Dedicated temperature sensor with 0.125 °C resolution.
  • AVR 8-bit microcontroller (MCU) with 8 KB programmable flash.

Witty Pi 4 Mini has very similar design with Witty Pi 4, however it doesn’t come with a DC/DC converter onboard, and it uses super capacitor for RTC time keeping when no power supply is connected. Witty Pi 4 Mini has solder pads on the back, which allow you to solder a DC/DC converter (LDO or switching DC/DC converter) there.

ACCURATE REALTIME CLOCK AND ON/OFF SCHEDULING

The realtime clock (RTC) on Witty Pi 4 Mini has been calibrated in the factory and Witty Pi 4 Mini’s firmware also makes temperature compensation for the crystal. This makes the RTC very accurate and the actual annual error is limited within ±2ppm. When your Raspberry Pi boots up, the time stored in the RTC will overwrite the system time. As a result, your Raspberry Pi knows the correct time even without accessing the Internet. You can schedule the startup and/or shutdown of your Raspberry Pi, and make it a time-controlled device. You can even define a schedule script to schedule complicated ON/OFF sequence for your Raspberry Pi.

Scheduling the ON/OFF sequence for Raspberry Pi is the most popular feature of Witty Pi, and it is extremely useful for systems that powered by battery. By only turning on Raspberry Pi when necessary, the battery can be used way much longer with Witty Pi installed.

TEMPERATURE CONTROLLED DEVICE

The temperature sensor on Witty Pi 4 Mini has 0.125 °C resolution. The temperature data is used for compensating the crystal and make the RTC more accurate.

You can also specific the action (startup or shutdown) when temperature goes above or below the preset threshold. Which means you can also make your Raspberry Pi a temperature-controlled device.

E-LATCHING POWER SWITCH

Witty Pi 4 Mini implements an e-Latching power switch, which is very similar to the power switch on your PC/laptop computer. You can gracefully turn on/off your Raspberry Pi with a single tap on the button. The software running in background will execute the shutdown command before the power gets cut, and it avoids the data corruption caused by “hard” shutdown.

SINGLE I2C DEVICE

Witty Pi 4 uses MCU to emulate a single I2C device with default address 0x08, and also map all I2C registers in realtime clock and temperature sensor as virtual I2C registers in the same device. You can access all I2C registers in realtime clock and temperature sensor via the single I2C device emulated by Witty Pi 4.

The advantage of this new design is that Witty Pi 4 hides other I2C devices (realtime clock, temperature sensor) and becomes the proxy of them to talk to Raspberry Pi. Because the I2C address used by Witty Pi 4 can be changed to any value, you can always avoid the I2C address conflicting.

UWI SUPPORT

Witty Pi 4 Mini is fully supported by UWI (UUGear Web Interface), and you can access you Witty Pi 4 Mini from any device that have network access.

SOFTWARE INSTALLATION:

Witty Pi 4 Mini uses the same software as Witty Pi 4. You just need to run these two commands in your Raspberry Pi to install Witty Pi 4 Mini’s software:

pi@raspberrypi:~ $ wget https://www.uugear.com/repo/WittyPi4/install.sh
pi@raspberrypi:~ $ sudo sh install.sh

The software and firmware of Witty Pi 4 Mini are open-sourced. You can find the source code on GitHub.

PACKAGE CONTENT:

Each Witty Pi 4 Mini package contains:

  • Witty Pi 4 Mini board x 1
  • M2.5 x 10mm plastic screws x 4
  • 4mm plastic spacer x 4
  • M2.5 plastic nut x 4
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SKU: 84483002319

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Cary johnson
Whiting, US
★★★★★ 5
its a great fun toy fir all of us
Color: Red-Blue, Size: Medium Size 2 (6")
its very tough so our dogs cant tear it up but soft enough so they get an easy hold. They absolutely love. great dog toy!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 27, 2026
M
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momOfMaxx
Chelsea, US
★★★★★ 5
zelda‘s “indoor” ⚽️ ball!
Color: Squeaky Green, Size: Medium Size 2 (6")
zelda loves her soccer ball - because of the fabric “tabs”, and the way she treats her toys, we keep it inside. she loves to place all of her toys and bones on our bed, after they’ve been cleaned. this ball is perfect and soft enough to throw it down our steps, where she will run down, retrieve it, and bring it back to the bed. it arrives deflated and comes with the pump and two needles - the pump is not the sturdiest and felt like it was not inflating, but after only having to reflate it once with a bit of air since receiving it ~5-6 months ago, it still holds up!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 2, 2026
D
Verified Purchase
Desy
Louisville, US
★★★★★ 3
Small for a medium
Color: Red-Blue, Size: Medium Size 2 (6"), Color: Red-Blue, Size: Medium Size 2 (6")
I got medium.. and it does not look like a medium ball.. it’s rather small. It’s pretty sturdy and my dogs went crazy for it but it’s definitely not the size I thought it was going to be 😂 my dogs chewed one strap within 5 minutes of having it but they’re dogs and that’s what they do lol. I bought this to be an outside ball for them! It’s pretty light but that’s probably because it’s small. Not soft? But feels like a soccer ball. It also had no smell coming out of the box. Also comes with a pump and an extra thing to put in the ball to pump in case you lose one. I like these balls, I expect them to be chewed up because that’s what I bought them for! Fun for my dogs and they are! But the size… it is not medium and that’s the only reason for 3 stars 😂😂😂 Other then that I recommend, your dog will definitely love this! Inside or outside playing! Alone or with another dog!
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Reviewed in the United States on October 15, 2025
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Verified Purchase
James T.
Port Orchard, US
★★★★★ 5
Great toy for a GSD
Color: Blue Gray, Size: Extra Large Size 5 (9")
My GSD loves to grab the flaps and shake her head with the ball bouncing of the side of her head. This is her favorite toy. I thought she would puncture it but it has held up great since she likes to grab the flaps rather than biting the ball.
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Reviewed in the United States on May 6, 2026
R
Verified Purchase
Richard H Harrison
Battle Creek, US
★★★★★ 5
Great toy to play fetch with the dogs.
Color: Black/White, Size: Large
These balls are a great dog toy to play fetch with your dogs. This not the first ball I have gotten for the dogs. Just the right size and weight for medium sized dogs. I have less concerns about them possibly choking on these soccer balls versus tennis balls. So I can leave them out for them to play with. The are easy to inflate using the included pump. My only concern is the durability of the straps as my dogs have almost torn off one the straps of the previous ball I purchased.
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Reviewed in the United States on May 2, 2026

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